# US 5,707,548 A · Materials and device incorporating phoshors

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- Number: US 5,707,548 A
- Document ID: US5707548A
- Status: Granted
- Kind: A
- Application number: 08/507,331
- Filed: 1995-10-06
- Granted: 1998-01-13
- Earliest claimed: 1993-12-24
- Assignees: British Nuclear Fuels plc
- Inventors: Terence Alan King; Stephen Shuttleworth; Sven Glyn Roden
- Web page: https://patentgrep.com/patent/US5707548A

## CPC

- C09K 11/02: Use of particular materials as binders, particle coatings or suspension media therefor
- C09K 11/7705: {with alkali or alkaline earth metals}
- C09K 11/7773: {with alkali or alkaline earth metal}
- G21K 4/00: Conversion screens for the conversion of the spatial distribution of X-rays or particle radiation into visible images, e.g. fluoroscopic screens (photographic processes using X-ray intensifiers G03C5/17; discharge tubes comprising luminescent screens H01J1/62; cathode ray tubes for X-ray conversion with optical output H01J31/50)
- G21K 2004/08: {with a binder in the phosphor layer}
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- G21K: HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES

## Abstract

A storage phosphor material comprising a storage phosphor of the kind in which electrons excited by incident ionizing radiation may be trapped in stable trap sites and subsequently released by stimulation such as photostimulation, wherein the phosphor is contained within a host matrix which comprises a sol-gel glass in which the storage phosphor is incorporated as a dopant.

## Claims

### Claim 1

A process of preparing a storage phosphor material comprising a storage phosphor within a porous glass or dried gel matrix, said method comprising doping a porous glass or dried gel matrix by diffusing an active phosphor thereby uniformly distributing the active phosphor through the porous matrix.

### Claim 2 (depends on 1)

The process as claimed in claim 1 wherein the active phosphor is applied to the matrix as a colloid.

### Claim 3

A process of preparing a storage phosphor material comprising a storage phosphor within a porous glass or dried gel matrix, said method comprising the steps of:
(a) preparing a sol of Si(OH).sub.4 and a phosphor;
(b) forming the sol of step (a) into a three-dimensional network, and thereafter
(c) drying, ageing and sintering the network over temperatures in the range of 100.degree. C. to 1000.degree. to form a porous glass or dried gel matrix in which the phosphor is uniformly distributed.